InstaMAT’s file type is the InstaMAT Package file (.IMP). An InstaMAT Package contains all of the related projects and resources inside it. This makes it easy to share files without having to manage associated resources. When InstaMAT Studio saves information to disk it is done by saving the package.
In InstaMAT Studio it is possible to save a project independently from the package it resides in. This is useful when working with multiple projects in the same package and they reference each other.
For example, you have an Element graph creating a material and that Element graph is used in a Layering project to texture an asset. With InstaMAT it is possible to make adjustments to the Element graph material, then save the material project, and then switch tabs to see the changes reflected in your Layering project.
Saving the package will write the changes to disk to the (.IMP) file. To save changes to the active InstaMAT Package file, this can be done using the Save Package command Alt/Option + S from the File menu to save the entire package to disk. This will automatically save changes to any projects within the package as well.